From: Ingo Molnar <mingo@elte.hu>
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Roland McGrath <roland@redhat.com>,
lkml <linux-kernel@vger.kernel.org>,
systemtap <systemtap@sources.redhat.com>,
DLE <dle-develop@lists.sourceforge.net>
Subject: Re: [PATCH -tip 3/3] Add get_signal tracepoint
Date: Tue, 17 Nov 2009 06:03:00 -0000 [thread overview]
Message-ID: <20091117060130.GB30852@elte.hu> (raw)
In-Reply-To: <4B01C95B.1070302@redhat.com>
* Masami Hiramatsu <mhiramat@redhat.com> wrote:
> > - signal IPI/wakeup events
>
> All signals might be used for IPI, isn't it? :-)
I mean, to analyze the various dynamic delivery details of how a signal
send affects a target task:
1) which task/PID was selected to be woken
2) if the task got woken (from sleep) due to the signal sending
3) if it was already woken, whether it needed an IPI via kick_process()
What proportion of signals were wakeups and what proportion hit an
already running task is a relevant question to ask when analyzing the
performance characteristics of signals.
Ingo
next prev parent reply other threads:[~2009-11-17 6:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-13 22:52 [PATCH -tip 1/3] Pass mm->flags to binfmt core_dump for bitflag consistency Masami Hiramatsu
2009-11-13 22:52 ` [PATCH -tip 3/3] Add get_signal tracepoint Masami Hiramatsu
2009-11-13 23:53 ` Roland McGrath
2009-11-14 0:12 ` Ingo Molnar
2009-11-16 21:52 ` Masami Hiramatsu
2009-11-16 22:11 ` Roland McGrath
2009-11-16 22:40 ` Masami Hiramatsu
2009-11-16 23:01 ` Roland McGrath
2009-11-16 23:46 ` Masami Hiramatsu
2009-11-17 6:03 ` Ingo Molnar [this message]
2009-11-17 15:25 ` Masami Hiramatsu
2009-11-14 0:29 ` Masami Hiramatsu
2009-11-13 22:52 ` [PATCH -tip 2/3] Add coredump tracepoint Masami Hiramatsu
2009-11-13 23:39 ` Roland McGrath
2009-11-14 0:00 ` Masami Hiramatsu
2009-11-14 0:02 ` Ingo Molnar
2009-11-14 0:06 ` Roland McGrath
2009-11-14 0:14 ` Ingo Molnar
2009-11-14 1:49 ` Roland McGrath
2009-11-14 0:26 ` Masami Hiramatsu
2009-11-13 23:09 ` [PATCH -tip 1/3] Pass mm->flags to binfmt core_dump for bitflag consistency Andrew Morton
2009-11-13 23:25 ` Ingo Molnar
2009-11-13 23:45 ` Masami Hiramatsu
2009-11-13 23:16 ` Roland McGrath
2009-11-13 23:23 ` Ingo Molnar
2009-11-13 23:30 ` Roland McGrath
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